Deployment Descriptors and EJB Roles
The deployment descriptor for an EJB is the ejb-jar.xml file included in the ejb-jar file used to deploy the bean. As you’ve seen in earlier chapters, you can control several characteristics of an EJB by using the entries in its deployment descriptor. From defining the transactional properties of methods to assigning security restrictions, you can change the behavior of a bean in many ways without having to change its code. This is the advantage of declarative control over being required to do everything programmatically. Having a declarative means to specify how your beans operate and relate to other objects and resources makes it easier to reuse them in multiple applications.
Most of what you define in ...
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